{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/12687?format=json","vulnerability_id":"VCID-13kq-f8uw-dyhn","summary":"Incorrect Default Permissions\nThe `on_get_missing_events` function in `handlers/federation.py` in Matrix Synapse has a security bug in the `get_missing_events` federation API where event visibility rules were not applied 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